Machine tool for working ring-shaped workpieces

Abstract

The machine tool is provided for working ring-shaped workpieces ( 1 ), in particular one-piece turbine wheels, so-called “bladed rings”. It has a rotatable chucking device ( 2 ) for a workpiece ( 1 ). Said chucking device is mounted on a carrying part ( 4 ), which in turn is supported by a supporting component ( 5 ). In order to keep the dimension ( 14 ) of the length by which the carrying part ( 4 ) projects beyond the workpiece ( 1 ) on the side facing the supporting component ( 5 ), as low as possible, the carrying part ( 4 ) protrudes into the chucking device ( 2 ) to such an extent that it projects at least through the boundary surface ( 7 ) of the workpiece ( 1 ) facing the supporting component ( 5 ). A saving of space is achieved in this way and, therefore, enhanced accessibility is obtained for the tool to the side of the workpiece ( 1 ) facing the supporting component ( 5 ).

1 . A machine tool for working ring-shaped workpieces, with at least one chucking device for a workpiece, said chucking device being rotatable around a first rotation axis; a driving device for rotationally driving the chucking device; a carrying part for the chucking device, said carrying part being arranged coaxially with the first rotation axis; a supporting component receiving the carrying part; and with at least one tool spindle drivable around a second rotation axis, whereby the chucking device and the tool spindle are movable in relation to one another, wherein the carrying part protrudes into the chucking device to an extent such that it projects at least through the boundary surface of the workpiece facing the supporting component.  
   
   
       2 . The machine tool according to  claim 1 , wherein the carrying part is rotatably supported vis-a-vis the supporting component with the help of a pivot bearing.  
   
   
       3 . The machine tool according to  claim 1 , wherein the carrying part is non-rotationally connected with the supporting component, and that the chucking device is rotatably supported on the carrying part with the help of at least one pivot bearing.  
   
   
       4 . The machine tool according to  claim 2 , wherein at least one pivot bearing is farther removed from the supporting component than the boundary surface of the workpiece facing the supporting component.  
   
   
       5 . The machine tool according to  claim 1 , wherein for rotationally driving the chucking device, the driving device is a torque motor surrounding the carrying part.  
   
   
       6 . The machine tool according to  claim 1 , wherein the chucking device is adapted to pivot around a third rotation axis arranged at right angles in relation to the first and second translation axes.